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Date May 2018 Marks available 3 Reference code 18M.2.SL.TZ2.T_4
Level Standard Level Paper Paper 2 Time zone Time zone 2
Command term Calculate Question number T_4 Adapted from N/A

Question

A new café opened and during the first week their profit was $60.

The café’s profit increases by $10 every week.

A new tea-shop opened at the same time as the café. During the first week their profit was also $60.

The tea-shop’s profit increases by 10 % every week.

Calculate the café’s total profit for the first 12 weeks.

[3]
b.

Calculate the tea-shop’s total profit for the first 12 weeks.

[3]
d.

Markscheme

12 2 ( 2 × 60 + 11 × 10 )      (M1)(A1)(ft)

Note: Award (M1) for substituting the arithmetic series formula, (A1)(ft) for correct substitution. Follow through from their first term and common difference in part (a).

= ($) 1380     (A1)(ft)(G2)

[3 marks]

 

b.

60 ( 1.1 12 1 ) 1.1 1      (M1)(A1)(ft)

Note: Award (M1) for substituting the geometric series formula, (A1)(ft) for correct substitution. Follow through from part (c) for their first term and common ratio.

= ($)1280  (1283.05…)     (A1)(ft)(G2)

[3 marks]

d.

Examiners report

[N/A]
b.
[N/A]
d.

Syllabus sections

Topic 1—Number and algebra » SL 1.2—Arithmetic sequences and series
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